You still have not said how much your field dressed deer weigh. What is good sized? That varies big time by location. Our field dressed does weigh about 70-90lbs typically. That will yield about 25-35lbs of boneless meat.

Still, as I mentioned earlier...40% of dressed weight is probably typical. If you get more you are doing well. And I'm sure most butchers are honest, but some butchers probably do skim. My guess is if they do, its a pound or two, not something like 10 lbs from one deer.

The other thing... I'd bet 80% of hunters have no idea what their field dressed deer actually weigh. They almost always overestimate. For about $50 you can get a nice hanging scale that will make you feel like a fool on guessing your deer field dressed weight.

The bigger the deer, the farther off most folks are. I bought a scale a long time ago, and have weighed hundreds of deer. Its fun when a buddy says they got a big one and I take my scale over and they scratch their head as to how come their guess is so far off what the actual weight is. They sure feel heavy dragging, unless they are a dink.